GCN Circular 5253
Peter Garnavich and Agata Karska (Notre Dame) We observed the position of GRB 060604 (Page et al., GCN 5212) with the Vatican Advanced Technology Telescope and 2KCCD camera on 2006 June 5.45 UT (16.5 hours after the burst). Six R-band images, each with an exposure time of 120s, were combined and a source detected at the Swift/UVOT position. Using an average of five USNO-B1.0 stars (magR2) to set the zero-point we estimate the brightness of the afterglow at R=21.6 +/- 0.2 mag. This is only slightly fainter than the observation by Tanvir et al. (GCN 5216) six hours earlier and suggests a slow decay or contamination from the host galaxy. This message may be cited.